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UNITED STATES PATENT OFFICE.

HENRY PETRIE FLETCHER, OF FOREST LODGE, NEAR SYDNEY, NEW SOUTH WALES,AUSTRALIA.

PROCESS FOR THE CONVERSION OF WATER PAS'IES INTO OIL PASTES.

1,317,784. No Drawing.

To all whom it may concern.-

Be it known that I, HENRY Pn'rnrr. FLETCHER, a subject of the King ofGreat Britain, residing at or Arundel street, Forest Lodge, near Sydney,in the State of New South Wales, Australia, have invented certain newand useful Improvements in Processes for the Conversion of Water Pastesinto Oil Pastes, of which the followin is a specification.

his invention relates to improvements in the manufacture of oil pastesand has been. devised in order that the water in a water paste may beremoved therefrom and oil substituted for the said water withoutnecessitating an intermediate drying operation and to obtain asatisfactory commercial product.

In the production of certain oil pastes such as that wherein white leadis the base, the material under treatment assumes at one stage ofmanufacture the form of a wet pulp from which (according to theprocesses heretofore enerally used) it is necessary to remove t e waterand to thereafter permeate the material with oil.

The salient feature of this invention resides in the provision ofchemical and mechanical means whereby the pulp is permeated with oil toform an oil paste and the contained water is expelled withoutnecessitating a distinct drying operation.

The wet pulp which is required to be converted into an oil paste isfirst treated by the addition of a predetermined quantity of borate ofmanganese. The proportion of borate of manganese to wet pulp would varywithincertain limits hereinafter clearly defined according to thepercentage of water contained in the pulp, the quantity of oil required.to be incorporated, and the timeavailable for mixing. When treatingthick pastes, that is pulp aving' a comparatively low water contentborate of manganese added should be small, and when there are to betreated slush pastes that is those having a comparatively high watercontentthe proportion of borate of manganese should be relatively hiher.

The preferred proportion for pulp aving a water content of approximately20% by weight is 9 grains of borate of manganese to one pound of wetpulp, which corresponds to approximately a of one per cent. For slushpastes the proportion may be Specification of Letters Patent.

the proportion of n ed Q t- 12 L9- Application filed October 17, 1918.Serial No. 258,644.

progressively raised according to the water content to a maximum formost pur oses of twenty-five grains to the pound 0 wet pulp. Under nocircumstances should the proportion of borate of manganese to wet pulpexceed'one-half of one per cent. other- Wise the desired effect will notbe attained in a satisfactory commercial manner, as an excess of borateof manganese in the pulp will saponify the paste.

After the treatment above described a required quantity of oil is addedto the pulp and the mass is subjected to mechanical working and mixing,the water being expelled from the pulp andthe oil combining therewith.This working or mixing is contlnued until the oil paste is of therequired consistency.

For the urpose of carrying out the workmg and mixing operation on acommercial scale any ordinary mechanical device or machine known in theart and found suitable maiy be employed.

nstead of using borate of manganese as hereinbefore described, borax orother boracic acid saltsmay be employed, though a slightly higherproportion of such substance is necessary.

In the example of wet pulp to be treated, I have mentioned white lead asan example, but the invention is not confined thereto."

What I do claim is 1. A process for the conversion of water treatment ofwet pulp by the addition of boracic acidsalts and the mechanical workingof 'the'resulting mass with a required quantity of oil.

2. A process for the conversion of water pastes into oil pastescharacterized by the treatment of wet pulp by the addition thereto ofborate of manganese and the mechanical working of the resulting masswith a; required quantity of oil.

3. process for the conversion of water pastes into oil pastescharacterized by the chemical treatment of wet ulp by the additionthereto of not exce mg one-half per cent. by weight, of 'borate ofmanganese and the mechanical working and mixing of the resulting masswith arequired quantity of oil.

4. A process for the conversion of water pastes into oil pastes whereina wet pulp is subjected to the action of borate of manganese, saidborate of manganese being added in the proFortion by weight of notexceeding one-hal per cent.

5. A process which com rises adding to a pul of white lead carryingabout 20% of we r, an amount of borate of manganese equal to between theapproximate limits of one-eighth r cent. to one half per (gent, relativeto t e wei ht of said pulp.

6. The herein described process which comprises mixing a pulp of whitelead with a small amount of a borate, then adding oil and working themass.

In testimon whereof I aflix my signature in presence 0 two witnesses.

HENRY PE'TRIE FLETCHER.

Witnesses M. STARPELL, R. BOULTON.

